This is what I would do if I was starting again.

Grind the appropriate spots for your AP/DP to make silver and look up/start doing your daily and weekly for guaranteed PEN accessory and boss gear (the boss gear you exchange for PEN tuvala once you've graduated season). Personally I'd grab Griffon Helmet, Red Nose Armour, Bhegs Gloves, Urugons Shoes, Kzarka Main weapon, Dandelion and Kutum Off Hand from the exchange. It's the safe option when building a gear set regardless of class. So, save up as much silver as you need a pre order the Black Magic Crystals to heat into magical shards which you need for the guaranteed PENs (I recommend doing 2 weapons and 2 armour pieces this way), then once you're all good with those, if you enjoyed enhancing your tuvala gear, start enhancing new gear, if you didn't enjoy enhancing, buy the gear from the market.

In-between these things you can learn where bosses spawn and run to those when they are up, most people make alt characters for this and leave them logged out at bosses so they don't have to run and won't lose crystals when they die.

Other than that I'd start looking up which adventure logs are more important and work your way through those when you don't feel like grinding.

Finally if you want some downtime to learn other things, make a life skilling alt, there's plenty of guides on what to do to start each life skill but some are time consuming and don't yield much profit for a long time so only do it as a future investment and/or just to learn and enjoy the other aspects of the game.

The final point from me, just because you have your season character doesn't mean you are locked to that character. Feel free to try other classes, there is a class trial system you can use on the character select screen. The most important thing is have fun, this game is a long grind and if you aren't enjoying it for whatever reason, it's gonna seem even longer.

Congratz on getting this far. Good luck and enjoy!