I’ve set up my primary marketing channel. What do I focus on next?

I am currently building a B2B SaaS as a solo founder. I have been getting some pretty good feedback from early users, and I am trying to figure out exactly where to direct my marketing efforts next.

Up until now, my entire strategy has been relying on manual LinkedIn outreach. I spent the last few months really testing and dialing in an effective messaging strategy that actually seems to be converting quite well. The last 2 weeks went really well and now I have too many clients to keep doing fully manual outreach. Right now I’m in the process of porting over my manual workflow to expandi, and once I have that sorted I need to figure out my next move.

I will have the bandwidth to tackle a second channel, but I am getting serious analysis paralysis trying to pick one. Cold email feels like the most natural progression from LinkedIn, but I keep reading horror stories about deliverability right now, and setting up all the infrastructure seems daunting. Another option is paid ads on places like Reddit or LinkedIn. I have a small budget I could allocate there, but I know B2B ads can burn through cash incredibly fast if you don't know exactly what you are doing. Finally, there is video content or video ads. I keep hearing this is where the highest ROI is right now, but I have absolutely zero video editing experience. I would have to outsource the production and everything, which just adds a whole different layer of management and cost.

Has anyone else been in this exact position as a solo founder, when you have extremely limited time and resources how do you decide which channel to pull the trigger on next? Would love to hear what worked (or failed) for you guys when scaling past your first channel.