You made a wise choice. Like @howard stated, this is what I would have done, wait, aside from the Rumble 40, it is exactly what I did. I did not outgrow my amps, since I went kind of big, but I outgrew the Zoom. That said, I still have a Zoom B1x-four, and a Zoom MS-60B. I used them both on my pedal board until I got the pedals that I was using each one as.
Not only that.
The Zoom B1-Four (i had that also, but sold it after getting a B1x-four from @PamPurrs for a price that could not be refused) is invaluable as a learning tool.
Like @spidey9 said, you can get lost in playing with it, however, this is not time wasted, in fact it is time very well spent. There is no better way to learn about effects, effects chains, and it is an intro into building a pedal board if, in time you go down that route. I don’t know if it is a majority of us, but a lot of us end up going into the Pedal rabbit hole. Also, not sure if it is a majority, but alot of us also started with the Zoom B1-Four, B1x-Four, B3n, or even the MS-60B, or a combo of them first, using them as our instructor, teaching us about FX and Pedals.
This is less costly, and most likely alot less frustrating them buying pedals you read about, chaining them together, and then finding you don’t like one or all of them, and selling them off and getting something different.
Of course, there are exceptions to that rule, as I, myself to some extent have played with alot of pedals, before deciding which one I want to keep on my board, and Mike (@itsratso) is an extreme example of this, changing things all the time ( I say this in the nicest way), but there is nothing wrong with this either, cuz I had a great time experimenting with actual pedals, even after learning about the FX in the Zoom first, cuz it allowed me to be more selective when doing pedal demo’s and buying. I opted to use Amazon Free returns for this. I would get a couple, Reverb pedals for example, and test them out next to each other and then return one, two or all of them, and look at others. If it were not Covid, I probably would have just gone down to GC or Sam Ash and tried them out, but it was Covid, and Amazon Free Return policy worked out for me.
There are other threads to talk more about this, like the one @skydvr linked you to, so read thru it and ask as many questions as you need to, you will get plenty of people willing to help you with whatever you are seeking to know.