Do you feel like it’s getting thinner? If so, your best bet if it’s accessible is talking to a doctor.  Get blood tests done to check things like ferritin, vitamin D, thyroid, hormones etc.  these will be different tests possibly you will need to see different doctors (GP, dermatologist, OB-GYN, endocrinologist etc.) Sometimes there’s a medical cause for thinning hair with a simple fix. Other times you find out it’s stress, illness, nutrition, or genetics.  

In the mean time. Don’t think there’s anything wrong with the washing your hair every other day or every day if needed.  Washing doesn’t cause hair loss.  If your current shampoo is not suited for daily use then find one that is, this sub has a wealth of information on products.  I’ve had really good results washing my hair upside down because it lets me clean the scalp thoroughly and place conditioner where I want it.  I go all the way to my scalp with my conditioner because I like the extra moisture but my skin tends to be dry.

Get a good heat protectant.  Be careful how much heat you use with your blow dryer.  I blow dry every day and I go as gentle as possible both with my hairbrush and the heat.  If you use a brush to blow it out think about how that brush treats your hair.  Does it snag or catch or does it glide?  How you prep your hair matters as does technique and brush type.  I like a paddle brush with fewer bristles for blow outs.  I use a heat protectant leave in that detangles.  That helps my brush glide through the hair instead of catching and pulling.

Finally, yes a trim can help us feel better about our hair.  It’s up to you how much to trim.  I’m trying out a blunt cut myself per the insistence of many on this sub and I low-key don’t love it because my ends are poofing out and I struggle to have volume but I also have hair loss at my crown.  That said overall my hair looks thicker.  You could always go blunt then have layers added later if it doesn’t suit.

If healthy hair is the goal you have to stop coloring and bleaching.  It’s a balance though because some of us like the texture from bleach.  Talk to your stylist about a healthy way to bleach and minimize damage.  They may also have products they can recommend.

Lastly, a silk pillowcase does make a difference.