Rec Room

According to a graph released on official Rec Room forums you need what seems to be 2k xp to reach level 30. It's unclear if that's the total amount of xp or just what you need to get from lvl 29 to 30.

https://images.squarespace-cdn.com/content/v1/5fa5929d1cf2d4...

It also seems like there is a cap to how much xp you can get every single day. This daily xp cap is mentioned on multiple forums. Either a cap or glitch which seems to reset every day. Please note your xp only increases after you left a room/new round starts. Some sources suggest to reset the game if xp doesn't increase.

It seems you can earn 192.8XP on the first day and max 150xp per every other day. 12 days to get get this achievement, 92 days for lvl 50

XP REQUIRED FOR EACH LEVEL (TOTAL):
1: 21.5XP ------- 7: 150XP ------ 13: 342.8XP --- 19: 600XP ---- 25: 1214.2XP
2: 42.8XP ------- 8: 171.4XP ---- 14: 385.7XP --- 20: 642.8XP -- 26: 1328.5XP
3: 64.2XP ------- 9: 192.8XP ---- 15: 428.5XP --- 21: 757.1XP -- 27: 1442.8XP
4: 85.7XP ------- 10: 214.2XP ---- 16: 471.4XP --- 22: 871.4XP -- 28: 1557.1XP
5: 107XP ------- 11: 257XP ------ 17: 514.2XP --- 23: 985.6XP -- 29: 1671.4XP
6: 128.5XP ----- 12: 300XP ------- 18: 557.1XP --- 24: 1100XP -- 30: 1785.7XP

My xp cap resets at 00:00 UK time, Max in the comments section said his xp cap resets at 20:00 EST

Here's a graph for those who want to know what their daily cap should be. Check your level first (e.g.: 23.8), use the graph to find how much xp you have at lvl 23.8, add 150xp (in this case lvl 25.1), that should be your daily cap. Use RED LINE FROM 1-10, PURPLE LINE FROM 10-20, GREEN FROM 20-30, BLACK FROM 30-40 AND ORANGE FROM 40-50
https://www.desmos.com/calculator/mk7kpy0pvm
(Zoom in to see the lines better)

My daily progress, results will vary if you fail to reach a daily cap on some days
Day 1: reached lvl 9 xp cap ----------- Day 7: reached lvl 23.8 xp cap
Day 2: reached lvl 13 xp cap --------- Day 8: reached lvl 25.1 xp cap
Day 3: reached lvl 16 1/2 xp cap ----- Day 9: reached lvl 26.5 xp cap
Day 4: reached lvl 19 3/4 xp cap ----- Day 10: 27.5 xp cap
Day 5: reached lvl 21 1/4 xp cap --- Day 11: reached 29.1 xp cap
Day 6: reached lvl 22 1/2 xp cap --- Day 12: lvl 30 !!!!! YAAAY

To see your own level open your watch interface (menu button) and click the top left corner (profile). This will display your profile dashboard including what level you are.

Some ways to get XP:

Daily login bonus:
Logging in every day grants you small amount of XP.

Cheering people:
Dpad left and up to select cheer, approach someone and hold LT. This will bring up a menu where you can cheer people. Limit 16 per day.

Getting Cheers:
If someone happens to give you "cheer" a notification will pop up. Confirm the cheer to get small amount of XP.

Completing challenges:
There are weekly and daily challenges in your watch interface. Completing those challenges rewards you with an item and xp

Playing games:
Most important of all, playing games. I tend to stay away from team games like: paintball, laser tag, baseball etc. I find it easier to play solo games like: disc throw or quest games (^GoldenTrophy, ^CrimsonCauldron).
As pointed out by Max you should only play rec room original games or games with #RRO in descriptions, just to be safe hit the first icon in game filter menu (square box icon with some lines in it)
With quest games up to 4 people work together to clear stages of enemies. The more enemies you kill the more xp you seem to get, hence if you are in a lobby alone start the game. Take it easy and let the enemies come to you. It's a one hit kill so be careful.
With disc throw up to 4 people compete against each other to get a disc from point A to B. Again if you're in a lobby alone, start the game.

Making rooms:
Probably the hardest one on this list. Make a room and publish it. If it's good enough people have the chance to like it (cheer), more people like the more xp you get. It's difficult for a room to become popular. Wouldn't waste my time on it.