I made changes after I had my first too.
I have a Brazilian blow dry every six months and a cut at the same time. Single best thing I've done for my previously frizzy hair.
If I have my hair up, I put it in a claw clip rather than just in a bobble as I feel it looks smarter.
I focused a lot on (basic) skincare. Body lotion after each shower, cleaning my face properly each evening, using moisturiser morning and evening etc. No fancy or expensive products but being consistent with it.
I always wear makeup but it is very minimal. Tinted moisturiser, tinted lip balm, mascara are my three I put on every day. Plus perfume, even if staying at home. I like smelling nice and it feels like I'm treating myself.
I would like manicures but couldn't be doing with the expense so I just keep my nails short, neat and clean. I use hand cream (and foot cream) and cuticle oil when I'm sat in front of the TV in the evenings.
Clothes wise I kept things that fit well but chucked anything that didn't fit or flattered me. Plus I upgraded my go to clothes so I know I often reach for leggings and a hoodie so I got myself smarter, upgraded versions of these so I looked slightly less slobby.
I bought myself some good quality, simple jewellery and I live in it. A bracelet, necklace and stud earrings that I shower in, sleep in etc. Just a few items that I swap around every so often but it makes me feel like I wake up and don't need to think about jewellery as it's already sorted.