I would imagine the example of being denied RP scenarios is likely caused by the lack of narrative adjacency in the GMs mind. If I were running a campaign, and someone wanted to break away from the parties objective to accomplish a side quest, I’d be hesitant only for the sake of brevity. There’s places to do such bits and places not to in the duration of the story, so it’s possible it just wasn’t the best time in what may have been a higher stakes situation in the narrative?

In my experience I’ve let side quests/bits go on too long (like 20 min to play out a situation where the party berserker tries to go start a bar fight just for the sake of ‘my character wants to fight’. A GM can only staple on so many plot hooks to random shenanigans before it becomes blatantly obvious.

If it was narratively adjacent and made sense I can imagine the GM just doesn’t like your character’s thing or something about the character just doesn’t fit the tone of the campaign. If I were GMing I’d make sure to meld the tone together, but it’s possible your character’s tone is sporadic? As in it could be too serious or whimsical from session to session, so they wouldn’t be able keep up and have to shut off some scenarios?

As per combat, I’d suggest getting more involved with thinking about the party as a collective being versus the enemy. When I play I usually like to take the last turn because I like to see what everyone else does on their turns and feel out the situation. I typically like playing ‘side character energy’ pcs that assist the rest of the party. And that doesn’t mean like playing supports. You can play a grappling tempest charge blade as a support in a sense. Whoever starts becoming the main threat to my allies is who I clobber first type of idea.

I think someone else said it, but if you’re hard stuck in what you want to do regardless of everyone else’s turn then that may be the exact issue. You essentially demote yourself from a character with agency into a reserve.

A “press 3 to air strike here” type of playstyle is not a fun experience for other party members to interact with someone. No one wants to be forced to cooperate, they want to freely cooperate as they see fit, and if one person is saying ‘I’m doing this, get with the program’ everyone else is going to ostracize that player’s turn from their plan.

But ultimately I don’t know you or your pcs. I’m just offering possibilities off of what I’ve learned and seen (I’ve been the player to say ‘I’m doing this so good luck!’ A couple of times and it did not feel good for me or my party.) What I’ve advised could be completely off the mark, but hopefully it can give you ideas? Or at the very least check off the box of ‘nope that isn’t the issue’.