When pursuing the CA exam, you intend to qualify at the highest level for an accountant in India. If you achieve it, what next? Most people choose to do an MBA, in the hopes to add more value. But an MBA holds value if done right and if from a reputed B. School. This may again require a GMAT or CAT score, which is another ball game entirely.
If the incremental value and credibility added directly to your core skill-set are more than the incremental time you have to invest, any accountant would see it as a good proposition. The US CPA designation, which is essentially an American CA, is vastly more acceptable in international processes and skilled-labor markets and opens up more lucrative work opportunities, across the globe. The good thing is, you can pursue it along with your CA and it only has 4 independent exams (Audit, Tax, Accounting, and Business). The entire course can be completed in less than a year for full-time students, part-timers may take longer though.
Your CA certifies you in IND-AS, which is very closely related to IFRS (widely accepted GAAP in Europe and Asia). The CPA qualification, however, certifies you in US GAAP (widely accepted over the western part of the world) and IFRS. This enables you to be a truly global accountant, with international recognition and credibility.
Another good option for CA candidates is to earn the US CMA designation (Certified Management Accountant), which is an equivalent to ICWA (now CMA, Cost Management Accountant) in India. Unlike the Indian CMA/ICWA which focuses purely on Costing, US CMA is for Management Accountants. US CMA only has 2 exams (Part-1 and Part-2), where the focus is on Accounting and Business subjects, covering a total of 10 fields of work, for Management Accountants. Just like the US CPA, the US CMA designation enjoys similar international credibility and recognition and can be pursued along with your CA.