Classes / church toddler groups (once open - I had a COVID baby so they weren't always, but it meant that when they were I went a bit OTT with them)
We probably did try soft play for the first time around 9 months or so - we went to a 'nicer' one that cost a fortune but had a specific crawling babies area, and a lovely sensory room. It was pretty clean. These days we take our chances at Wacky Warehouse with the rest of the mob, but there are some nicer ones around and about. There are also quite a few play cafe type places round here too - enough that it makes me think that it's not just a local thing and there might be some near you too - the kind that have different role play areas set up and construction toys etc.
More days out type things like sealife centre, science museum near us which has a great kids bit, smaller museum in local town which actually has a nice play area, farms. We're lucky to have a nice farmshop and cafe nearby that has a lovely outdoor play area but also lots of toys undercover too, used to be free though they charge a few quid now.
I wouldn't have known half the things existed round here for babies and toddlers unless I'd gone to the baby then toddler groups and joined their whatsapp groups - again because of lockdown that was why it became a whatsapp thing - I know they are a lot of people's idea of hell on here but I only had good experiences really, and the whatsapp groups have been so useful with people sharing information about places you can go, what's on for kids and families, what special offers/ vouchers or freebies are going. It might be worth looking to see if there's any mums/ parents facebook groups for your local area that share similar info - it's quite helpful to have somewhere to just say 'I'm sick of the park, any idea for what else we can do today?'
We still did walks too, just wrapping up. Once it gets to December you have a whole month of walking around looking at lights, outdoors when the weather isn't too terrible, and if it is then you've got garden centres and shopping centres etc.