If I found a product which is good in all season should i go with that ?

Its very much depend on the product, but the scenario you have define about the product you can defiantly go for the product, as the product is having good demand throughout the year and a boost come in the months of January and March, this product is not seasonal as it going good and and having the boost period as well, but before starting selling product on amazon you must analyze the product properly, you must check how much profit you will make, and what the competition in the market of this product, and also you have to figure it out how much advertising budget will be spend.

if the product is not seasonal and also fulfil your requirements such as
Search volume is great
average revenue is high
average rating is low
low brand dominancy
and many more factors if the products meets all the criteria than defiantly go for it.

Stella, if your product has good demand throughout the year, you should go with it. From January to March would be your product’s peak sale period. So, you should try to not run out of stock in these 3 months when your product has its peak sales period. Otherwise, if other factors about this product are good, then go for it.

There might be some specific reason for the product to get maximum sales from January to March and if the product has good demand throughout the year then you can go with this product because you will get ranking by working throughout the year and once the peak season will come your sales will also improve.