I totally agree with the many pp's who say to let them know, politely, that enough is enough and to have a polite refusal at the ready for next time they ask for something.
Yes, we should be civil with our neighbours because we never know when we might actually need them but it doesn't do to be in each other's pockets and it's always good to have your own back up plans because you can't necessarily rely on other people.
Like one pp, I take in parcels for a few of my neighbours, mainly because I'm the one who's at home all day every day whilst they're all out at work and occasionally they'll accept one for me. We say hello in the street and ask after each other's families' welfare but that's pretty much where it all stops, with the exception of the lovely teenage lad on the one side who loves my dog and will occasionally ask whether he can take him out for a walk. I've never asked him to, he does it because he wants to. I've always sent a tin of chocolates to each of my 2 immediate neighbours at xmas just because I'm neighbourly and I do give my dog walking neighbour birthday gifts, I feel it acknowledges his generosity.
I would also say that I'm disabled and live alone but have always been very independent, I've never asked anything of my neighbours although on a few occasions when I've been due to go into hospital for operations I've let them know that i would be away from home for a few days and they've said that they would keep an eye on the house and check in on me afterwards to see whether I needed anything but no knock on the door or phone call ever came.
I did also wonder throughout all these lockdowns whether they would think that I might need a little help, like bringing a loaf of bread or bottle of milk in for me when they were going shopping for themselves, because I had to shield myself, but no. Fortunately, as previously mentioned I am very independent (I've had to be) so I've just sucked it up and accepted that if by having to go shopping I might catch covid and die, then so be it but I'm still here and I have no-one to thank for it but myself.
I'm looking to move house in the next 12 months and 'hope' that my new neighbours will have similar ideas on how neighbours should be towards each other.