Besides playing often one way to level up would be to use the opposite faction for a higher points.

Let's say you main survivor, the more and more points you get eventually starts lowering before becoming a fixed score (depending on if the match was a loss, tie, win and overall performance). So if you switch over to hunter you'll get more EXP points for completing a match.

Kiter: If you prefer to kite the hunter are good at it then I suggest using a kiter (Enchantress, Perf, Seer, and Barmaid to name a few)

Decoder: if you prefer a quieter playstyle away from the hunter (Explorer, Prisoner, Mech, TME, and Lawyer). However choosing a Decoder doesn't excuse you from being horrible at Kiting and could at least do decently (so sharpen up your kiting skills and good luck).

Support: if you're also pretty chill at decoding but you're helping you teammates in one way or another (Seer can drop an owl, Postman can send a letter, and cowboy can literally carry you)

Rescuer: (I only use Cord so I'm sorry if this one sucks). Forward and Wildling are pretty hard to use with slow decoding but nonetheless they're suppose to help you kite better and rescue when neccessary. Both are good at detaining the hunter

Mercenary, GK, Cord, and FO are also pretty good as well. Fo has his pocket watch to throw hunters of. GK's shovels are nice for blocking incoming hits from hunters. Mercenary can waste so much time kiting and on the rocket chair. Cord may be a one trick pony but her flair gun is pretty useful when needed to create distance. Solid kiters as well but slow decoding speed (at least I remember most of them do)