For me the Braxtons were not terrible, but it started the massive shift of focus on the show - going from family units and simple life to guns and violence.
What I would do is the following -
We don't need several doctors or coppers. For years H&A worked well with one of each. Go back to that.
Bring back the school, and thus re-introduce a teacher and maybe a head as characters.
Get rid of the gang/violence side and bring in a couple of families - as in 2 parents, 2 kids etc... Not grown up adults, with long lost relatives, but proper family.
The kids then go to the school....
Bring back the caravan park properly, and also bring back the fostering and mentoring of "waifs and strays"
H&A used to be a beacon of promoting how family can be two things - the one you are born into, and the one that shows you love. That has been lost. Jett was probably the last proper character that was adopted, yet before him it was a pretty regular thing.
Have a younger teen cast in who will have relatable problems - dating, social media, studying problems, drink/drugs temptations, and modern issues.
Theres a lot of deadwood in the show and part of it feels like it has come from so many leaving quickly at the start of Covid.
Lyrik was always a hard sell and whilst individually all the characters have found their feet, it really is time for them to move on so we can focus back on family and roots. Bree and Xander are terrible characters and both badly acted. Tane / Mack / Flick / Cash / The Band - have all been in for 3+ years now and it is time to change the direction by refreshing that cast list.
Either get Marilyn back with John and have them as the new loving foster couple, or bring in a partner for John to fulfil that role. Its classic, but it works.
Same with Irene - she is set up really to be on her own, but she has always historically opened up her home to those in need.
Mali and Rose could even become the new nucleus of a new family. Both of them ideal to try raising kids/foster.
Bring the show back to family. Look at small every day issues (Maybe have a family on the breadline struggling - maybe a late teen/early 20s same sex couple , a peer pressure storyline, maybe a school bullying one, even have a mixed race couple getting some trouble by some opposed to it etc...) that actually exist and explore them to get people asking questions.
The show has lost its identity over the years. When was the last time we had a proper natural disaster - a flood, a fire, an earthquake and we saw the COMMUNITY respond. Not every death has to be via a shooting / stabbing etc...