Hello! Dave mentioned you to me in a quick chat earlier! Nice to meet you!

• Is there are "best time to post" window? Everyone is different. But I have found the best days for me for visibility are Tuesday, Thursday and Friday- between 7am EST and 3pm EST- you can look on steemworld.org to get tons of account information about yourself including voting, power, etc

• Should I just pick one topic, and stick to it until I find my groove? I came on steemit with the main focus of gardening and homesteading. I joined a Discord community and group based on these topics and have been flying every since. You can start with one or two topics (preferably your passions) and always buid off those. I've been on here for 7 months and post more than just gardening and homesteading. I do steemit info, DIY, etc. But yes, once you find your rhythm, expansion is inevitable.

I would recommend joining DIscord if you haven't already- you really need the support of a group and commujnity.