1st time Mum - changes take time, so don't go by one day of doing something differently. You need to try it for 3 days or so first, and then re-evaluate.

There is nothing wrong with a routine itself, as long as it is working for you. Now it's not working for you, but it's not a problem that you have been doing it. Routine is actually still what you need probably, but a more flexible routine, driven by your baby's needs and also by yours (eg if you need to go shopping, then baby just goes down later), not by the clock.

So I would say the first step is to keep the same pattern going - ie the order of feed, sleep, play. But instead of looking at your clock or watch, look at your baby. If she seems tired, put her down. Perhaps try this for a day or two without going out, so you can work out when might be a good time to fit in a shopping trip. Then on day 3, wait until the time when there a good gap between sleeps and go out.

I expect what will happen is that you will end up with a flexible routine which is not much different to the one you have now. But that you will be able to go out more often as you will just fit it in. And if she gets overtired because she went down late, she might go down easier the next day and then it will fall into place again. GL with it! You sound like you are doing a great job so far.