Is the satisfaction level with forehead volume fillers good even in the summer?

The only filler treatment I've ever had was on my nose bridge a long time ago.

I am asking because I lack information.

Because the forehead lacks volume

My face looks too flat and my features seem very plain.

I want to get forehead fillers this time.

Since it's summer, I wear a hat often and sweat a lot.

I'm worried about what to do if my satisfaction with the fillers is lower than in other seasons.

For those of you who got fillers this summer, were you satisfied?

I shouldn't wear a hat until the forehead fillers settle, right?

Until how long can I avoid wearing a hat after getting fillers?

I suppose wearing a hat isn't banned forever on a forehead filled with fillers, right?

Since it's summer, hats are practically survival gear, so I'm a bit worried.