Hi @Anushree – thanks for this.
As a consumer, I spent more time on Facebook/IG than Twitter/LinkedIn, so it felt more organic to produce and promote content on those channels to attract an avatar like me (small business owner). We tested LinkedIn early on, and it seemed like the engagement wasn’t close to what we saw on Facebook and Instagram, so when we got one channel to work, we continued to scale and invest heavily in it. Every 3 days, we increased our ad budget by 20%. It led to some pretty scary credit card bills 
LinkedIn is working better now than it was 3 years ago, but I suggest producing content where you can get the most engagement.
Initially, we used interest based targeting for people that liked certain facebook pages (the Shark Tank TV show, Tony Robbins, Entrepreneurs Organization, etc). That produced a large audience that we could drive to our website. Then, we refined the audience to be a smaller group that was like the customers that engaged with our first ads. Eventually, we relied on lookalike audiences of visitors that signed up for a trial, and then of customers that converted from a trial, and then smaller and smaller groups of our best customers.